xkcd is, of course, the "webcomic of romance, sarcasm, math, and language", written and illustrated by Randall Munroe.

Recently, Randall drew a single panel comic called Time. It was just a guy and a girl resting on what seemed to be a hillside. About every half hour, the comic would get a slight upgrade. This has been going on for a week, and we've discovered that the hillside is actually a beach.